Electrical calculators that get to the answer fast.
Use practical calculators for amps, watts, kVA, voltage drop, wire size, batteries, solar, motors, protection and more.
Featured calculators
High-intent tools visitors commonly need.
3 Phase Power Calculator
Calculate three-phase real power from line voltage, line current and power factor.
ElectricalAC Power Calculator
Calculate AC real power for single-phase or three-phase loads.
ElectricalAh to Wh Calculator
Convert amp-hours to watt-hours.
ElectricalAmps to kVA Calculator
Convert line current to apparent power in kVA.
ElectricalAmps to kW Calculator
Convert electrical current to kilowatts.
ElectricalAmps to VA Calculator
Convert current and voltage to apparent power in VA.
ElectricalAmps to Volts Calculator
Calculate voltage from current and resistance.
ElectricalAmps to Watts Calculator
Convert current in amps to real power in watts.
ElectricalAppliance Electricity Cost Calculator
Estimate an individual appliance’s energy use and running cost.
ElectricalBattery Backup Calculator
Estimate backup time from battery bank voltage, amp-hours, usable depth of discharge and efficiency.
ElectricalBattery Capacity Calculator
Estimate required battery capacity in amp-hours for a load and desired runtime.
ElectricalBattery Charging Time Calculator
Estimate battery charging time from capacity, charge current and charging efficiency.